Dr. Richard B. Gaffin, Professor of Biblical and Systematic Theology, Emeritus at Westminster Theological Seminary in Philadelphia, joined the Christ the Center panel to discuss the nature of the gospel and the relation of the benefits of redemption to union with Christ. The significance of the contribution of John Calvin was delved into, especially his handling of the duplex gratia dei or two-fold blessing of justification and sanctification and how this relates to our union with the risen Lord.
Of special interest was the conversation about how justification and sanctification relate to each other within union. A discussion was also had regarding the distinction between definitive and progressive sanctification and the biblical basis for that distinction. The panel also discussed the relation of the historia salutis (the history of redemption or the accomplishment of redemption) to the ordo salutis (the order of salvation or its application).
Dr. Gaffin is the author of numerous articles and books, including Resurrection and Redemption, Calvin and the Sabbath, Perspectives on Pentecost, By Faith, Not By Sight and he has edited a collection of the shorter writings of Geerhardus Vos, Redemptive History and Biblical Interpretation. In May of 2008 Dr. Gaffin entered into honored retirement and was the recipient of a festschrift entitled Resurrection and Eschatology co-edited by Lane G. Tipton and Jeffrey C. Waddington.